<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg xmlns="http://www.w3.org/2000/svg">
  <title>Test 'feMorphology' with a negative value for its 'radius'</title>
  <!--
    From https://bugzilla.mozilla.org/show_bug.cgi?id=485786

    The negative value should disable the primitive output, but should
    not disable the entire filter effect.
  -->
  <filter id="f1">
    <feMorphology operator="dilate" radius="-1" result="transparentBlack"/>
    <feMerge>
      <feMergeNode in="SourceGraphic"/>
      <feMergeNode in="transparentBlack"/>
    </feMerge>
  </filter>
  <filter id="f2">
    <feMorphology operator="dilate" radius="-1"/>
  </filter>
  <rect width="100%" height="100%" fill="red"/>
  <rect width="100%" height="100%" fill="lime" filter="url(#f1)"/>
  <rect width="100%" height="100%" fill="red" filter="url(#f2)"/>
</svg>
